Improvement in cranks



MPEES. PMOTOJ-ITHOGRAPMER, WASHINGTON, U C

@anni fitr.

CYRUS T. MOORE, 0F GI LMYAN TON, NE W HAMPSH1RE. Leners Patent No.89,423, dated Apro 27,71869.

IMPROVEMENT IN CRANKS; The Schedule referred to in these Letters Patentand making part of the lama.

To all persons to whom thescpresents may come:

Be it known that I, GYnUs T. MOORE, of Gilmanton, of the county ofBelknap, of the State of New Hampshire, have made a newaud usefulinvention, having reference to Shafts, and the Driving-Cranks thereof;and Iv do hereby declare the same to be fully described -in thefollowing specification, and represented in the accompanying drawings,of which- Figure l is a top view of a shaft and its crank, with myinvention applied thereto;

Figure 2 is a front view; and

Figure 3 is a rear view of the shaft-head, with the reversible pawl, andits holding-mechanism, to be hereinafter described.

The object of my invention is to prevent accidents, which are liable tooccur, by a crank, carried around by a shaft, after having been vput inrevolution by power applied to a crank, the invention being speciallyapplicable Yto manumotives, or what are termed hand-cars, as used onrailways, and for the transportation thereon of workmen and their tools.Persons on such cars have been known to be seriously injured, andoccasionally killed in consequence of being struck by the drivingJcrankwhile the car was in motion.

invention enables the crank-shaft to be revolved in either direction bythe crank, and prevents such crank from revolving with the shaft, whilethe latter may be in motion, after a person may have released orwithdrawn his hands from the crank.

In the drawings- A denotes a shaft, and

B, its crank, the latter being applied to the former, so as to becapable of being freely revolved thereon.

There is fixed to the shaft alongside of the crank, a circular disk orhead, C, provided with a circular-curved slot, a, made through it,concentrically, and near its periphery.

Within this slot is a reversible pawl, D, formed as shown in -top view,in iig. 4, and in edge view, as represented in figs. 2 and 3, it beingpivoted, at its middl,'to the disk, by a pin, b extended into such disk,and through the pawl.

The saidl pawl has two notches, c d, made in its rear edge, and onopposite sides ofthe middle thereof'.

A latch, E, pivoted to the disk, and pressed against the pawl by meansof a spring, e, arranged as represented, and fixed to the disk, serves,with such notches, to hold the pawl in either of its positions, that isAto say,.in that sh'own in g. 1, or in that represented in iig. 5.

The pawl should be so pivoted to the disk as to enable the pawl to bemoved both parallel to the disk, and vaway from it, at right angles, orthereabouts.

From this it will be seen that the pawl maybe adjusted, and held ineither of the positions, as re'presented in the drawings; and when it isin either of them, if we turn the 'crank one way, such crank willabutagainst one end of the pawl, so as to turn the disk and shaft; butif we reverse the motion ot the crank, it will so act against the pawl`as not only to press it back within the disk, but pass across and by it,and not revolve the shaft.

Therefore, it will be seen, that if, while the shaft may be in the actof being revolved by the crank, the hand of the mover be suddenlyremoved from the crank, the latter will drop into a vertical position,and the momentum of the shaft will cause it to revolve, and every timethe pawl may be carried against the crank, such pawl will fall back, andthe crank will pass it, without producing any rotary motion of it.

I do not claim a single pawl and ratchet, arranged with a crank andshaft, so as to cause the cranks, when in revolution, to turn the shaft,and the latter while in revolution, and the power for turning the crankmay have been withdrawn therefrom, to continue to revolve, withoutrevolving the crank; but

What I do claim as my invention, is the combination and arrangement ofthe reversible pawl D, and its holding-latch E, and spring e, with theshaft-head C, and the crank B, applied to the shaft A, substantially inmanner as specied.

CYRUS T. MOORE. Witnesses:

R. H. EDDY,

SAMUEL N. PIPER.

